ΔH=0
ΔG=0
ΔH=Δg=ΔS=0
ΔS=0
A reaction having equal energies of activation for forward and reverse reactions has ΔH=0. The enthalpy change for a reaction is the difference in the energies of activation for forward and reverse reactions. When energies of activation for forward and reverse reactions are equal, the difference is zero.